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error vm-255 on demand not working

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error vm-255 on demand not working

My On Demand stops working pretty much every night.  I get the error code VM-255, which tells me to unplug the box.  This only resets it if I actually unplug the coax too.  I have tried with two different sets of coax wires.  It started, so I got a new converter box, and it continued.  Comcast technicians then blamed me because I installed the new box.  It seems to get confused once it's working occasionally, and quits again, but generally it just won't connect when I press On Demand.  I have to unplug the coax every time I want to use it.  The TV portion works fine.  I have Standard definition, and slow non-Comcast internet service.  Can anyone tell me if the problem is in Comcast's programming?